The Dragonfly 40 is aggressively canvassed for its weight.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
8.2 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 37.7′, the Dragonfly 40 tops out around 8.2 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √37.7′ LWL = 8.2 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
28.5
Performance-oriented — carries a lot of canvas for its weight.
Displacement / Length
106
Ultralight — responsive and fast, but carries less stores.
Hull Speed
8.2kts
PHRF Fleet Position
Where the Dragonfly 40 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Saga 409
Estimated Speed by Wind
Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.
| Point of Sail | 6 kts TWS | 10 kts TWS | 15 kts TWS | 20 kts TWS |
|---|---|---|---|---|
| Close-hauled40–50° | 3.9 | 4.9 | 5.5 | 5.7 |
| Close Reach60° | 4.7 | 5.9 | 6.6 | 6.9 |
| Beam Reach90° | 5.7 | 7.2 | 8.1 | 8.8 |
| Broad Reach120–135° | 5.3 | 6.7 | 7.5 | 8.1 |
| Run150–180° | 4.2 | 5.4 | 6.0 | 6.2 |
These are simplified estimates based on hull speed (8.2 kts),
SA/D (28.5), and empirical efficiency curves — not instrument-measured
polars. Real-world speed varies with sea state, bottom condition, sail trim, and current.
Speeds in gold approach hull speed;
bold gold means near or at hull speed.
Wind Range & Comfort Envelope
Estimated wind ranges for comfortable sailing on the Dragonfly 40 — based on sail area, ballast, and displacement characteristics.
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–16 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
16–24 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
24+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.
How It Compares
Side-by-side with the boats most often cross-shopped against the Dragonfly 40.
| Dragonfly 40 | Dehler 41 Cr | Farr 40 One Design | Malo 40 2 | Saga 409 | Solaris 42 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 40.7 | 40.9 | 40.7 | 40.5 | 40.8 | 40.6 |
| LWL | 37.7 | 36.3 | 35.3 | 34.5 | 36.0 | 37.6 |
| Beam | 27.6 | 12.8 | 13.2 | 12.6 | 12.5 | 13.1 |
| Displacement | 12 | 19 | 10 | 20 | 19 | 19 |
| Ballast | — | 7 | 4 | 7 | 7 | 6 |
| Sail Area | 968 | 876 | 1 | 936 | 807 | 1 |
| Performance | ||||||
| PHRF | — | — | — | — | 87 | — |
| SA/Disp | 28.5 | 19.3 | 36.2 | 19.8 | 17.7 | 22.7 |
| Bal/Disp | — | 37.1 | 45.5 | — | 36.9 | — |
| Comfort | — | 27.0 | 14.7 | 30.6 | 28.3 | 25.4 |
| Capsize | — | 1.90 | 2.39 | 1.83 | 1.85 | 1.95 |
| Hull Speed | — | 8.1 | 8.0 | 7.9 | 8.0 | 8.2 |